耐火度是耐火材料最重要的性质之一,是鉴定耐火原料和成品的重要标准。由于该厂所用的耐火原料及成品的耐火度都很高,一般都在1710℃以上,所以采用直立管式炉的土法检验,已不能满足要求,另外,由于镁砂缺乏镁制炉管无法解决。该厂化测室根据当地具体条件以及采用直立管式炉试烧的经验(热损过大,温度达不到要求)。所以采用了间接测温的办法,将锥盘置于高铝质的小匣钵内,将匣钵埋入焦炭中进行加热,这样虽然可以烧到1750℃左右的高温。但因高铝质钵的抗渣性较差,渣蚀过甚,故匣钵常与试料同时熔化,经研究,将匣钵改用矾土熟料软质粘土、(灰矸)、焦炭、石墨配料后,一举而成.后来为了便于直观测温,又进行了炉型、匣钵的改造,加上了窥视管,这样在加热过程中,不但可以直接观察炉内的情况,并可测量炉温,确切地控制终点,经过了20多次的试验,这个方法是成功的。在20多次的试验中,曾四次改变了炉型结构更换了四 Refractoriness is one of the most important properties of refractory materials and is an important criterion for the identification of refractory raw materials and finished products. As the refractory raw materials used in the plant and finished products are highly refractory, are generally above 1710 ℃, so the use of vertical tube furnace soil test can no longer meet the requirements, in addition, the lack of magnesium magnesia furnace tubes can not solve. The laboratory room according to the specific local conditions and the use of vertical tubular furnace test experience (heat loss is too large, the temperature does not meet the requirements). Therefore, the method of indirect temperature measurement is adopted. The conical pan is placed in a high-aluminum small sagger and the saggar is burned into the coke for heating. Although this can be burned to a high temperature of about 1750 ° C. However, because of the poor slag resistance of high aluminum mortar, slag erosion is too much, so often sagger and the sample melt at the same time, the study, the saggar changed to bauxite clinker soft clay, (ash), coke, Graphite ingredients, made in one fell swoop. Later, in order to facilitate visual temperature measurement, but also for the furnace, sag transformation, coupled with the peep tube, so that the heating process, not only can directly observe the furnace situation, and measurable Furnace temperature, the exact control of the end, after more than 20 tests, this method is successful. In more than 20 trials, the furnace structure was changed four times four times